Which country has the longest combined land border?

Russia
United States
Brazil
China
China's combined land border measures 22,117 km (13,743 mi) from the mouth of the Yalu River to the Gulf of Tonkin. China borders 14 nations, more than any other country except Russia, which also borders 14.
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Answers by country

Russia
United States
Brazil
China
answers
flagIndia
34%
21%
0%
43%
41
flagthe United Kingdom
47%
19%
3%
28%
106
flagRepublic of Ireland
63%
9%
0%
27%
11
flagPoland
54%
11%
6%
26%
13283
flagUnknown
50%
15%
7%
26%
26
flagGreece
44%
29%
0%
25%
27
flagAustralia
57%
14%
0%
23%
21
flagGermany
56%
19%
1%
22%
57
flagthe United States
49%
24%
6%
18%
215
flagthe Netherlands
43%
25%
12%
18%
16
flagItaly
64%
23%
0%
11%
17